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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This is an RFC for the design of VPlan following our original RFC[1], Dev Meeting presentation[2], and the patch posted for high-level review[3]. To recap, the
proposal involves introducing a Vectorization Plan as an explicit model of a vectorization candidate and update the flow of the innermost Loop Vectorizer accordingly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The patch[3] is designed to show key aspects of the VPlan model, demonstrating how it can capture precisely *all* vectorization decisions taken inside a to-be
vectorized loop by the current Loop Vectorizer, and carry them out. It is therefore practically a “No Change in Output intended” patch. The technical details are documented in the patch which includes an rst file and a pdf attached to the review on https://reviews.llvm.org/D28975#655369.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Comments are most welcome, here and/or on Phabricator.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Gil and Ayal.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">[1] [llvm-dev] RFC: Extending LV to vectorize outerloops, http://lists.llvm.org/pipermail/llvm-dev/2016-September/105057.html<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">[2] Extending LoopVectorizer towards supporting OpenMP4.5 SIMD and outer loop auto-vectorization, 2016 LLVM Developers' Meeting, https://www.youtube.com/watch?v=XXAvdUwO7kQ<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">[3] Patch titled “[LV] Introducing VPlan to model the vectorized code and drive its transformation” posted for review on https://reviews.llvm.org/D28975.<o:p></o:p></span></p>
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